My first sample program is based on the example in the appendix of the 22-SCM-232 Manual.
After unsuccessfully attempting to get an electronic copy from Rockwell Drives Tech Support, I broke down and typed in all the ladder and comments myself.
Once setup and testing was completed I added additional comments to the first run.
Requirements:
- RSLogix 500 Version: 6.1
- Additional Requirements: Micro1200 & PF4/40
- File Size: 61 kb
- Uploaded on: 02/09/04
- Entered By: Shawn Michael Tierney
My second program is based on the first, but uses the Modbus Master protocol available in the latest release of the MicroLogix 1200, as well as a 1761-Net-AIC.
The biggest obstacle in getting this configuration to work was trying to find the polarity of the comm lines (i.e. does + comm on the AIC go to A or B comm on the drive?) as well as realizing all the modbus addresses are offset by 1 (which even Rockwell Drives Div. missed in Rev 1 of the subsequently release tech note).
Since this file was published, Rockwell has release (and fixed) a tech note, and also has an excellent 2004 HOT LAB.
Requirements:
- RSLogix 500 Version: 6.1
- Additional Requirements: Micro1200 & PowerFlex 4 /40
- File Size: 60 kb
- Uploaded on: 02/09/04
- Entered By: Shawn Michael Tierney
Download Link:
Until next time, Peace ✌️
Shawn M Tierney
Technology Enthusiast & Content Creator
Have a question? Join my community of automation professionals and take part in the discussion! You'll also find my PLC, HMI, and SCADA courses at TheAutomationSchool.com.
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